US6018844A - Composite side skirt for powered sweeper - Google Patents
Composite side skirt for powered sweeper Download PDFInfo
- Publication number
- US6018844A US6018844A US09/162,807 US16280798A US6018844A US 6018844 A US6018844 A US 6018844A US 16280798 A US16280798 A US 16280798A US 6018844 A US6018844 A US 6018844A
- Authority
- US
- United States
- Prior art keywords
- skirt
- brush
- spacer
- assembly
- spacing element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
- E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
- E01H1/08—Pneumatically dislodging or taking-up undesirable matter or small objects; Drying by heat only or by streams of gas; Cleaning by projecting abrasive particles
- E01H1/0827—Dislodging by suction; Mechanical dislodging-cleaning apparatus with independent or dependent exhaust, e.g. dislodging-sweeping machines with independent suction nozzles ; Mechanical loosening devices working under vacuum
- E01H1/0854—Apparatus in which the mechanically dislodged dirt is partially sucked-off, e.g. dislodging- sweeping apparatus with dirt collector in brush housing or dirt container
Definitions
- the present invention relates to sweeping machines of the type shown in U.S. Pat. Nos. 3,892,008, 5,394,586 and 5,659,921. More specifically, the invention relates to a side skirt assembly of the type shown in the '921 patent. Sweeping machines carry a pair of side skirt assemblies, one at each end of the main sweeping brush.
- a suction fan maintains a negative pressure in the brush chamber, which sets up a flow of ambient, external air into the brush chamber from underneath the side skirts. This flow of air does not permit the brush-generated dusty air from exiting the brush chamber.
- An exception to this is a narrow region at the ends of the brush where the spinning brush first comes into contact with the ground. In this small region the brush generates an air pressure above atmospheric, and the vacuum air flow mentioned is not sufficiently strong to prevent the brush-generated flow of air from escaping under the side skirts and into the atmosphere.
- the air flow generated in the side skirt assembly disclosed herein is sufficiently strong to entrain the dust laden air in this region and transport it into a lower pressure region in the brush chamber via the air flow passageway formed in the side skirt assembly, thereby preventing it from escaping into the surrounding atmosphere.
- the side skirt assembly of the present invention includes an inner skirt and an outer skirt, both of which are flexible and are formed of a rubber or rubberlike material.
- the attachment of the spacer to the inner and outer skirts may be done by bonding, sewing or any other suitable manner.
- the spacer forms and defines the outline of a cavity between the skirts.
- the air flow will be from the lower rear air entrance to the cavity, through the side skirt cavity, and then into a forward area in the brush chamber where the adjacent brush bristles are moving up and tend to aspirate air out of the cavity into the brush chamber.
- This flow of air through the side skirt assembly disclosed herein will effectively eliminate dusting at the ends of the brush.
- the present invention relates to sweeping machines and more specifically to a side skirt assembly for a sweeping machine.
- a primary purpose of the invention is a side skirt assembly for a sweeping machine having a rotatable brush, which side skirt assembly is flexible, returns to its original shape after distortion during use and has flexible inner and outer skirts.
- Another purpose is a side skirt assembly as described in which the flexible inner and outer skirts are formed of a rubber or rubberlike material.
- Another purpose is a side skirt assembly as described in which the inner and outer skirts are joined together by a flexible resilient spacer which is in the form of a small rectangular element having a discontinuity for an ambient air entrance into the space between the skirts. There is an outlet from the space between the skirts formed in the inner skirt.
- Another purpose is a reliable, simply constructed side skirt assembly for a sweeping machine of the type described which uses a flexible spacer between two flexible side skirts to form an air cavity which has an air entrance formed by a discontinuity in the spacer and an outlet from the cavity formed by an opening in the inner skirt.
- FIG. 1 is a diagrammatic illustration of a sweeping machine with many of the internal parts being shown in phantom;
- FIG. 2 is a section along plane 2--2 of FIG. 1;
- FIG. 3 is a side view of an unattached left side skirt assembly
- FIG. 4 is a bottom view of the side skirt assembly of FIG. 3;
- FIG. 5 is a side view of one of the spacing elements
- FIG. 6 is a bottom view of the spacing element of FIG. 5;
- FIG. 7 is a side view of a second spacing element.
- the invention disclosed herein is a side skirt assembly typically found on a powered sweeping machine with vacuumized dust control such as the Tennant Model 385 sweeper.
- Tennant Company is the assignee of the present application and is also the owner of U.S. Pat. No. 5,659,921 showing an earlier form of side skirt assembly.
- the composite skirt which forms the side skirt assembly is a combination of an inner skirt, an outer skirt, both formed of a flexible sheet material such as rubber or a rubber substitute, and a flexible spacer sandwiched therebetween.
- Every sweeping machine has installed on its frame a pair of side skirts, one at the right end and one at the left end of the main brush.
- the two skirts are mirror images of each other, but otherwise are identical, so a description will be given of the skirt at the left end of the main brush relative to normal forward travel, and it will be understood that the description could also apply to the right skirt.
- the air flow generated by the composite skirt assembly of the present invention is sufficiently strong to entrain the dust laden air in this region and transport it into the brush chamber via the passageway in the side skirt assembly to be described herein, thereby preventing it from escaping to the surrounding environment.
- the side skirt assembly of the present invention is disposed parallel to the direction of travel of the sweeper. There is a clearance of 1/8" to 1/4" between the lower edge of the skirts and the ground.
- a flat, flexible piece of skirting fixed along an upper edge and hanging without a support along its lower edge cannot effectively resist in-plane loading such as that induced by ground drag. This loading can cause out-of-plane deformation.
- the skirts sag and/or take on a permanent set with their planar surface showing undulations. Any and all such deviations of the skirt surfaces from the original configuration can cause side trailing as well as dusting.
- FIG. 1 the sweeping machine is indicated to have a body shown generally at 10, and supporting wheels 12 and 14. As is conventional in machines of this type, there may be two forward driving wheels and a single rear wheel, although the invention should not be so limited.
- a rotatable brush 16 which extends transversely across the body of the machine and, as illustrated by the arrow 18, will be rotated in a clockwise direction to direct dust and debris forwardly into a debris collection chamber or hopper indicated generally at 20.
- a ramp 22 which defines the entrance to the debris chamber 20, with the debris chamber being forward of the brush as is customary in forward throw sweeping machines.
- a dust collection chamber 24 Positioned above and slightly forward of the debris chamber 20 is a dust collection chamber 24 having a filter assembly 26 therein, with the filter assembly having a movable shaker 28 mounted thereon. Further details of the sweeper are shown in U.S. Pat. No. 5,503,488 and 5,659,921, assigned to Tennant Company of Minneapolis, Minn., with the disclosure of both said patents being expressly incorporated by reference herein.
- a vacuum fan indicated diagrammatically at 30, with the vacuum fan creating an air flow path indicated by the series of arrows designated at 32.
- the air flow path begins directly adjacent the forward throwing sweeping brush 16, passes through the debris chamber 20, then through a series of baffles 34 into the dust collection chamber 24.
- the air flow path then passes through the filter 26 and exhausts from the vacuum fan as illustrated by arrows 38.
- the described dust control system is conventional in sweeping machines of this type.
- the side skirt assembly may be attached to the door 40 which is hinged along its front edge 42 and which covers the end of the sweeping brush and provides access thereto for maintenance and cleaning.
- the door 40 will carry the side skirt assembly of the present invention through a lower inwardly extending flange 44 which carries a support bracket 46.
- Bolts or other suitable types of fasteners indicated at 48 attach the side skirt assembly indicated generally at 50 to the bracket 46.
- the side skirt assembly includes an outer skirt 52 and an inner skirt 54. Both skirts are formed of rubber, a rubber substitute, or a similar type of flexible material.
- the tops of the outer and inner skirts, as indicated at 52a and 54a, will be flat against each other where the side skirt assembly is joined by the bolts 48, through the openings 56, to the bracket 46.
- the lower edges of skirts 52 and 54 will be nominally 1/8" to 1/4" above a surface 58 to be swept, but this may vary slightly.
- the skirt assembly is formed of a composite combination of elements which include the outer and inner skirts 52 and 54 and a flexible resilient spacer formed of a first spacing element 60 and a second spacing element 62.
- the spacing elements 60 and 62 may be bonded, sewn or otherwise permanently attached to the outer surface of the inner skirt 54 and the inner surface of the outer skirt 52.
- Spacing element 60 has a horizontal portion 64 and a vertical portion 66.
- Spacing element 62 has a vertical portion 68 and a horizontal portion 65.
- the disposition of the two spacing elements within the side skirt assembly is illustrated in FIG. 3. Together, the skirts and the spacing elements define an air cavity 70.
- the upper end of the vertical portion 68 of spacing element 62 abuts and joins the end of the horizontal portion 64 of spacing element 60.
- This discontinuity or space 72 Between the end of horizontal portion 65 of spacing element 62 and the lower end of vertical portion 66 of spacing element 60. This discontinuity or opening 72 forms an air entrance into the cavity 70. Air exits from the cavity through an opening 74 in the inner skirt 54.
- the vacuum fan 30 creates an airflow path through the sweeper as described earlier. In general it creates less than ambient air pressure around the brush, which causes external ambient air to flow under the skirts and into the brush chamber, thereby preventing dusty air stirred up by the brush from escaping outward into the surrounding atmosphere. However, as described earlier, there is an area where the rotating brush bristles strike the floor and in so doing generate a local region of above ambient air pressure which tends to push a small amount of dusty air outward under the side skirts at the ends of the brush and into the surrounding environment.
- the side skirt assembly performs an important function by keeping debris from spilling out of the brush chamber as well as providing an air seal so that the brush chamber can be maintained at a negative pressure relative to ambient air to prevent dust laden air from blowing out of the brush chamber.
- the skirts have to be positioned accurately with respect to the brush and the ground.
- the sweeping machine encounters operational conditions that tend to deflect the skirt from its ideal configuration. Uneven terrain can cause the skirts to be dragged on the ground, causing accelerated wear and tear and also warping. The skirts can get snagged and torn or dragged away from their as-assembled position. Any deviation of the side skirt assembly from its desired position can lead to dust puffing, debris trailing and accelerated skirt wear.
- the present invention provides a skirt system that is tolerant to such misalignment from the as-designed configuration so that its functionality does not deteriorate over a wide range of operational conditions.
- the composite skirt assembly is low cost, easy to install and maintain. It provides an effective shield to the brush chamber and overcomes many of the problems of the prior art skirts and skirt assemblies.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Cleaning In General (AREA)
- Filters For Electric Vacuum Cleaners (AREA)
Abstract
Description
Claims (11)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/162,807 US6018844A (en) | 1998-09-29 | 1998-09-29 | Composite side skirt for powered sweeper |
EP99307506A EP0990737A3 (en) | 1998-09-29 | 1999-09-22 | Composite side skirt for powered sweeper |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/162,807 US6018844A (en) | 1998-09-29 | 1998-09-29 | Composite side skirt for powered sweeper |
Publications (1)
Publication Number | Publication Date |
---|---|
US6018844A true US6018844A (en) | 2000-02-01 |
Family
ID=22587207
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/162,807 Expired - Lifetime US6018844A (en) | 1998-09-29 | 1998-09-29 | Composite side skirt for powered sweeper |
Country Status (2)
Country | Link |
---|---|
US (1) | US6018844A (en) |
EP (1) | EP0990737A3 (en) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002019885A2 (en) * | 2000-09-07 | 2002-03-14 | Tennant Company | Side skirt for a surface treating apparatus |
US20030019071A1 (en) * | 2001-07-30 | 2003-01-30 | Field Bruce F | Cleaner cartridge |
US20040040104A1 (en) * | 2002-09-04 | 2004-03-04 | Joynt Daniel L. | Retractable broom and dust skirt |
US20040040102A1 (en) * | 2001-07-30 | 2004-03-04 | Tennant Company | Foamed cleaning liquid dispensing system |
US20040068825A1 (en) * | 2002-10-11 | 2004-04-15 | Surtec, Inc. | Vacuum sweeping system for automatic scrubber |
US20040221407A1 (en) * | 2001-07-30 | 2004-11-11 | Tennant Company | Cleaning liquid dispensing system |
US20050022844A1 (en) * | 2003-07-30 | 2005-02-03 | Tennant Company | Ultraviolet sanitation device |
US20060137127A1 (en) * | 2001-07-30 | 2006-06-29 | Field Bruce F | Cleaning system utilizing purified water |
US20060150352A1 (en) * | 2003-09-02 | 2006-07-13 | Tennant Company | Hard and soft floor cleaning tool and machine |
US20060282965A1 (en) * | 2005-05-05 | 2006-12-21 | Tennant Company | Cleaning head for use in a floor cleaning machine |
US20070079457A1 (en) * | 2005-10-07 | 2007-04-12 | Dulevo International, S.P.A. | Protective structure for brushes of sweeping machines |
US20070089251A1 (en) * | 2005-10-21 | 2007-04-26 | Tennant Company | Floor cleaner scrub head having a movable disc scrub member |
US20080083430A1 (en) * | 2006-10-06 | 2008-04-10 | Mark Schwarze | Adjustable flexible flap for mechanized sweeper |
CN101845801A (en) * | 2010-05-24 | 2010-09-29 | 上海神舟汽车设计开发有限公司 | Dust control sweeper type side dust collection port for road sweeper |
US10092152B2 (en) | 2015-04-07 | 2018-10-09 | Tennant Company | Sweeper with a skirt assembly |
US10595697B2 (en) | 2016-02-02 | 2020-03-24 | Tennant Company | Surface maintenance machine with skirting to allow particulate pickup |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3719966A (en) * | 1970-12-09 | 1973-03-13 | Contract Cleaning Co Pty Ltd | Combined floor-polisher and suction cleaner |
US4320556A (en) * | 1980-09-12 | 1982-03-23 | Tennant Company | Surface maintenance equipment |
US4450601A (en) * | 1982-09-30 | 1984-05-29 | Shwayder Warren M | Sweeper drag shoe |
US4580314A (en) * | 1984-11-23 | 1986-04-08 | Michael J. Galanis | Suction cleaning device |
US4872233A (en) * | 1988-11-28 | 1989-10-10 | Athey Products Corp. | Street sweeper with cool springs supported drag shoe |
US4951342A (en) * | 1989-03-13 | 1990-08-28 | Duffy Wilson | Street sweeping drag shoe |
US5392492A (en) * | 1990-08-08 | 1995-02-28 | Fassauer; Arthur L. | Air-floated apparatus |
US5659921A (en) * | 1996-01-22 | 1997-08-26 | Tennant Company | Sweeper with double side skirts for dust control |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3892008A (en) | 1973-03-16 | 1975-07-01 | Tennant Co | Vented double skirt system |
US5394586A (en) | 1993-04-23 | 1995-03-07 | Holley Engineering Company, Inc. | Ballast sweeper dust control |
-
1998
- 1998-09-29 US US09/162,807 patent/US6018844A/en not_active Expired - Lifetime
-
1999
- 1999-09-22 EP EP99307506A patent/EP0990737A3/en not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3719966A (en) * | 1970-12-09 | 1973-03-13 | Contract Cleaning Co Pty Ltd | Combined floor-polisher and suction cleaner |
US4320556A (en) * | 1980-09-12 | 1982-03-23 | Tennant Company | Surface maintenance equipment |
US4450601A (en) * | 1982-09-30 | 1984-05-29 | Shwayder Warren M | Sweeper drag shoe |
US4580314A (en) * | 1984-11-23 | 1986-04-08 | Michael J. Galanis | Suction cleaning device |
US4872233A (en) * | 1988-11-28 | 1989-10-10 | Athey Products Corp. | Street sweeper with cool springs supported drag shoe |
US4951342A (en) * | 1989-03-13 | 1990-08-28 | Duffy Wilson | Street sweeping drag shoe |
US5392492A (en) * | 1990-08-08 | 1995-02-28 | Fassauer; Arthur L. | Air-floated apparatus |
US5659921A (en) * | 1996-01-22 | 1997-08-26 | Tennant Company | Sweeper with double side skirts for dust control |
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002019885A3 (en) * | 2000-09-07 | 2002-06-13 | Tennant Co | Side skirt for a surface treating apparatus |
US6507968B1 (en) | 2000-09-07 | 2003-01-21 | Tennant Company | Side skirt for a surface treating apparatus |
WO2002019885A2 (en) * | 2000-09-07 | 2002-03-14 | Tennant Company | Side skirt for a surface treating apparatus |
US20030019071A1 (en) * | 2001-07-30 | 2003-01-30 | Field Bruce F | Cleaner cartridge |
US20040040102A1 (en) * | 2001-07-30 | 2004-03-04 | Tennant Company | Foamed cleaning liquid dispensing system |
US8051861B2 (en) | 2001-07-30 | 2011-11-08 | Tennant Company | Cleaning system utilizing purified water |
US20040221407A1 (en) * | 2001-07-30 | 2004-11-11 | Tennant Company | Cleaning liquid dispensing system |
US20060137127A1 (en) * | 2001-07-30 | 2006-06-29 | Field Bruce F | Cleaning system utilizing purified water |
US7025834B2 (en) | 2002-09-04 | 2006-04-11 | Tennant Company | Retractable broom and dust skirt |
US20040040104A1 (en) * | 2002-09-04 | 2004-03-04 | Joynt Daniel L. | Retractable broom and dust skirt |
US20040068825A1 (en) * | 2002-10-11 | 2004-04-15 | Surtec, Inc. | Vacuum sweeping system for automatic scrubber |
US6990709B2 (en) * | 2002-10-11 | 2006-01-31 | Surtec, Inc. | Vacuum sweeping system for automatic scrubber |
US20050022844A1 (en) * | 2003-07-30 | 2005-02-03 | Tennant Company | Ultraviolet sanitation device |
US8029739B2 (en) | 2003-07-30 | 2011-10-04 | Tennant Company | Ultraviolet sanitation device |
US20060150352A1 (en) * | 2003-09-02 | 2006-07-13 | Tennant Company | Hard and soft floor cleaning tool and machine |
US8028365B2 (en) | 2003-09-02 | 2011-10-04 | Tennant Company | Hard and soft floor cleaning tool and machine |
US7665174B2 (en) | 2005-05-05 | 2010-02-23 | Tennant Company | Cleaning head for use in a floor cleaning machine |
US20060282965A1 (en) * | 2005-05-05 | 2006-12-21 | Tennant Company | Cleaning head for use in a floor cleaning machine |
US7690068B2 (en) * | 2005-10-07 | 2010-04-06 | Dulevo International, S.P.A. | Protective structure for brushes of sweeping machines |
US20070079457A1 (en) * | 2005-10-07 | 2007-04-12 | Dulevo International, S.P.A. | Protective structure for brushes of sweeping machines |
US20070089251A1 (en) * | 2005-10-21 | 2007-04-26 | Tennant Company | Floor cleaner scrub head having a movable disc scrub member |
US8584294B2 (en) | 2005-10-21 | 2013-11-19 | Tennant Company | Floor cleaner scrub head having a movable disc scrub member |
US20080083430A1 (en) * | 2006-10-06 | 2008-04-10 | Mark Schwarze | Adjustable flexible flap for mechanized sweeper |
CN101845801A (en) * | 2010-05-24 | 2010-09-29 | 上海神舟汽车设计开发有限公司 | Dust control sweeper type side dust collection port for road sweeper |
US10092152B2 (en) | 2015-04-07 | 2018-10-09 | Tennant Company | Sweeper with a skirt assembly |
US10595697B2 (en) | 2016-02-02 | 2020-03-24 | Tennant Company | Surface maintenance machine with skirting to allow particulate pickup |
Also Published As
Publication number | Publication date |
---|---|
EP0990737A2 (en) | 2000-04-05 |
EP0990737A3 (en) | 2000-11-02 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: TENNANT COMPANY, MINNESOTA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BASHAM, MICHAEL T.;D'COSTA, JOSEPH F.;ENGEL, TODD M.;AND OTHERS;REEL/FRAME:009496/0094 Effective date: 19980921 |
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Owner name: JPMORGAN CHASE BANK, NATIONAL ASSOCIATION, AS COLL Free format text: SECURITY AGREEMENT;ASSIGNOR:TENNANT COMPANY;REEL/FRAME:022408/0546 Effective date: 20090304 |
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Owner name: JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT Free format text: SECURITY INTEREST;ASSIGNOR:TENNANT COMPANY;REEL/FRAME:042188/0659 Effective date: 20170404 Owner name: JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT, ILLINOIS Free format text: SECURITY INTEREST;ASSIGNOR:TENNANT COMPANY;REEL/FRAME:042188/0659 Effective date: 20170404 |